http://en.wikipedia.org/wiki/Bacteria
In soil, microorganisms that reside in the rhizosphere (a zone that includes the root surface and the soil that adheres to the root after gentle shaking) carry out nitrogen fixation, converting nitrogen gas to nitrogenous compounds.This serves to provide an easily absorbable form of nitrogen for many plants, which cannot fix nitrogen themselves.
In soil, microorganisms that reside in the rhizosphere (a zone that includes the root surface and the soil that adheres to the root after gentle shaking) carry out nitrogen fixation, converting nitrogen gas to nitrogenous compounds.This serves to provide an easily absorbable form of nitrogen for many plants, which cannot fix nitrogen themselves.
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